He's donking into 2 people with the pfa to act last, I think that this flop hits his calling range very hard. Any small pocket pair, sc type hands. Looks to me like he is donking a set or straight, hoping for exactly this kind of reaction behind, looking to stack you.

You mostly see there two pair, set or straight, rather than draw, when you get all-in on the flop.
Because of your equity and not a big fold equity I´d just call flop and likely call turn and if you improve at some point then you can always shove.